What was found
BELOW 50 PERCENT THRUST LT ENG ANTI ICE VALVE CAME ON A FEW TIMES THEN RESOLVED PERFORMED L ENG IDLE RUN FOUND LT ENG ANTI-ICE VALVE LIGHT INTERMITTENTLY ILLUMINATED, C/W AMM 36-11-00-715-149, ASPCU OPERATIONAL TEST. FOUND ASPCU SHOWING LT HPSOV FAULT. FOUND MULTIPLE CRACKS ON THE INTERMEDIATE PRESSURE LOWER DUCT FORWARD OF THE HPSOV IAW AMM 36-11-01, FIGURE 401. REMOVED AND REPLACED THE NR 1 ENG AIR SUPPLY DUCT IAW AMM 36-11-01, PERFORMED TEST NR 1 ENGINE PNEUMATIC LEAK TEST IAW AMM 71-00-00-795-001-NOO ON NR 1 ENGINE.LEAK & OPS CHECKED GOOD.